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January 31, 2015

January 31, 2015

Posted by **Lauren** on Friday, January 2, 2009 at 1:06pm.

y= -x^2+2x

he told us to coplete the square to get us the vertex, but how do i complete the square with a - in front of the x^2??

- PreCalc -
**Damon**, Friday, January 2, 2009 at 2:54pmThis way:

-x^2 + 2 x = y

x^2 - 2 x = -y

x^2 - 2 x + 1 = -y+1

(x-1)^2 = -(y-1)

vertex at (1,1)

negative sign means opens down (sheds water)

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